is 2 2508691 - 1
has 755192 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LCB7CBE7EAD2C740Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26823.759467.6471 %32000001120000000.91808.0599 %24.677470.2547 %
Target2630.636265.0794 %110008500000.00571.4085 %0.641965.5712 %
Difference+5+23.1232+2.5677 %+3189000+111150000+0.9123+6.6515%+24.0355+4.6835 %

Known prime factors (1 factor, 69.2 bits, 0.00276009% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25086916982108334066003982492169.242139158396431964
22 × 32 × 7 × 13 × 139 × 305598151
2020-09-2413930559815147.5891.67453.1276

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-23ANONYMOUSv4_computers2048204800--0.0010.662%
2003-10-31Team Prime Ribv4_computers15000236250--0.0031.706%
2010-12-16JossManual testing2000020000--0.0020.622%
2011-01-01JossManual testing3000030000--0.0030.823%
2011-01-04JossManual testing5000050000--0.0051.130%
2011-10-03markrtiny16500039187506--0.0375.302%
2016-02-12mikrMSI320000011200000012--0.91811.835%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-15ANONYMOUSv4_computers212590.015
2016-02-23Mark RoseManual testing2592600.031
2009-02-07Sturle Sundebruch.ifi2602610.061
2012-06-12Sebastian HornbostelManual testing2612620.122
2013-01-23dbaughManual testing2622630.391
2015-02-18VictordeHollanderManual testing2632640.783
2015-02-18VictordeHollanderManual testing2642651.489
2015-11-04ramgeisManual testing2652662.979
2017-07-31Gordon SpenceManual testing2662675.957
2019-05-13TJAOIManual testing26726811.92


ECM factoring results:
Total ECM effort:6.466 GHz-days
Estimated T-Level:21.281
DigitsB1CompleteFacMiss
20110002.7696.271%
25500000.25677.397%
302500000.01698.397%


ECM Summary

B1B2factorcurvesGHz-days
500005000000706.282
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15ANONYMOUSv4_computersCB7CBE7EAD2C740D0.174
2018-06-03kkmrkkblmbrbkoldCB7CBE7EAD2C740D0.174


PRP results:
dateuseridcompidcofactorsres64
2020-09-24M Millercruncher
698210833406600398249
78A0E8086DC42A3B


CERT results:
dateuseridcompid
2020-09-24Steve SybesmaCS09


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 165000, B2 = 3918750 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.28 ~= 54-bit
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00